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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7efefc5ba475649040e9c05d782b5378540399a597682dff3b3fd7fd85d84367' 
  AND token = 'mr/PiRa2KmuyDEQooyeGpHy4sIR4Mc32ImR3xCv+goY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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