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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '620f1540c4b52b905b675ae7d0a14920e164b057d78070ad29fb65970787772c' 
  AND token = 'D9hGS/aEsKq1fuYVpzSwYuVfiS129Et3ylok9uJDNJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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