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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afc170e2916b393febf9160880dcac9a26cfe57607b8c95bf3b97cf6de24aab6' 
  AND token = 'PWOZtdfn3lj/gKFj6ewC9BdAvSs2AzBE2nMOYacXP/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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