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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ba5e98662586617b2012cc95af529f5939de24e9f5d600466d8700b41d03ed7' 
  AND token = 'DQ+VI+N0vgcImytpG9/Q2RmGdAVs8b9+z6x++U1cvyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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