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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69c81947047912fc13a0132b884367747efa23200b0e4eade955bfe3493833d8' 
  AND token = 'BC5Zox3sv1S7uby3LYv0mzHfaZ8TJ3YyFdmCXp5FUgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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