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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a62abba49a4d35c21647df1d2e5c9f96b29eafa17befeba3a4080e57b5ac9816' 
  AND token = 'hB+bQEgKRdBEHIQ1KinIAWCEAIAO3niYJfqm55Yq+Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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