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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88cc295247416b78b11d33f2518d1598fcda23da574dec77b14c1b068e528928' 
  AND token = 'TaMWZp6Pz8xix8RWZM4omeDO2pW7tejWus1gkM5TMHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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