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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '595a4ae0a12b92c8760dc4eb445176d1051c15c5a72d1133d45abe5825af109c' 
  AND token = 'yko9E6bXzYHx4HVLzrU73MsiYeGB5REyeCyHPRs94uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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