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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3556965f0f98f52eef5eaaf6d560c8a29398d46e8c6581cf9dac1538f7b14c65' 
  AND token = '4u2Do30OaCtIm7MvoAWPl577xNM0eS3tmkYUiUkSzq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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