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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac297deab87bb8dd84c8135228815f2bd7725d95fd82d8542f10be635ff4215e' 
  AND token = 'ypQvBwtg6AejQH9kZnw9Cs+1b3eL1fFDcbeTN15p6MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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