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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0ca36763e9fd61ee0d90d98a1f16918fad356f9af42814abe057a8593196321' 
  AND token = 'tyg1HTAteMniGs9BAj7SxDolU2dqAaL0u0J7o/Nzv0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}