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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acd7b99a498c4f414505efdbb3901ffb195e88e3f4a555019ffedec6b6e7f668' 
  AND token = 'g7aTTQGWyBZgoxv5qIEU0NWpk0TYtL6zlIfIcYT2Ptw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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