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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f7e7c7901effa408ace2b58c11a0bcb6fd52f753143df6193ea5f8e4c77c70f' 
  AND token = 'd4i942b+HEZsauOHmJ5YR2ainw7ezAJO6UFHLxnSlA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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