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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac1055e6b9b62dc2b40f5be131fc02ff2398a3cf2c761b7733652ade70d40984' 
  AND token = 'usFjuZN5EuE8uSQaOIJz6Q3qDREXagswQlOFhO2H1cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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