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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fac5184d06cd613a38fa7a769c7fb446447d0473bfd16fa86e8980f75b632990' 
  AND token = 'HwlE4f7PV6MJRKPTRsmFXBXz4P7cUM7+yXAHmd4QSYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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