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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6671cf15a1b73e10f49ff383d270fdfee8992bb7a8a13d1572d6c20b05eaaf4' 
  AND token = '+tO1Hyou7OfmsC5EeFUPiFHJ9tAevNJ38jLa2CBvZjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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