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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd976b0d48f9277a05936be71fee024868b1f5d7fc81e0dc47bb9685134955f3b' 
  AND token = 'WAYRMo2ioY5b87kFwtq9z57hon6SQz7XwYGRG1tCTbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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