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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f87a8be270391e8db45064e299c8c7ab4109d82cbcac95272061766d626e2cd4' 
  AND token = 'o9sw+twggJ2Hb4Q0vzSovSz2dNSEJd0nFm7a/htBj30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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