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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '038ea718f0cec9061dc11304a7383f56b4c2209a2206a1b2df0e9e3712a1421e' 
  AND token = 'bVF9QaYQwi1p04VOsf0EwQfufhZrZ+hOhWkjlBri5xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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