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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '526550daba0447686e2a61d2cff90d8b7fb7cf76d6e9d1a61ebc529a558fbb4c' 
  AND token = 't2Z0hx2HPeO3A18Ljb0LJn1RLTJEU+N3YD2c0hlF7Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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