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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89dac9c4e9acb59edee1393f9eb123a24a7cf311c38abf048b7eb00403762f96' 
  AND token = 'dTQvkXm2X1T5b2t9GtUexbxrUclN9QKt7V5P7o93sk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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