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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a93c06ba0e8c75c8b68e2f800020927dde57542e475c08261ffc4a11967d841c' 
  AND token = 'f8ygaa9E7WjkK/DKfTmN+SyBredNQ903nGb6VagMrh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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