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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ee0920dfe5fda384fd8c04f6f71437943dd5f4b2bf7a98373fbdd809a284b2b' 
  AND token = 'Cjc9ZemVReJNPsEV07F2Ylup88b4/FgsXc8SxCKgIZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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