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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f37d12c7cb1ab03b8ab20c48ba90c0f98c33d23bd9178b41d8a823375e19df42' 
  AND token = 'S3rXVMwNd30VaQCmOjiA6UcMZLhMVcnlMwvMYYaKoho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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