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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19a374e9d2fb1afe3abae2972f7a771f6ea9d0043c5ba1e520d2207d1efc1b2f' 
  AND token = 'TVWUPzpvuqDAAuuYEnnXBXS6rkd+oPx8Eh/au3Dd9jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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