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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3c2a3a5f87236728ddcc4627831d0ee92bc089601971021c1be4d6dacfcea3e' 
  AND token = 'kWMwlRo5a6PW9avWOm/MPEr68CgPkDX+mTx9e3qMOBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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