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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14482dc1b65fa60b785c0dd0aafa58a68b8c931db689af4f23698da3311a94cd' 
  AND token = 'v3iDuOdQp8iQ5ZJgDN3MMtvQyMnfaBKYtfIfqE2ayxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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