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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '424cad37a8d41e05f8b39d1a6fda5104a9dce19e081f027316a8ffb1961d6f2e' 
  AND token = 'T6lkKUuxnoHzch3okdxaV/d+3NKPYGuP7HDt0v+9o54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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