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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd71de9a03e03458d691548a9922e2a90f4d48868fdc0736c177a2b5cafd43d1a' 
  AND token = 'tcSfN7wwJ7iKLJIy7Cno2qlVGyNFwnarge6qNhHNLkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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