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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1592a2275818d2de74c74ef32b2008c1fb124ee053d875746cf04d09cf5f6257' 
  AND token = 'KLzGV09nxoLkikoZp1VccRrHgy+ozQ87GXEEJnf1ky4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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