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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e3d5e67ede4c935e98815fa9157163182aef29b6d6c7beb633f7d7d74df86bb' 
  AND token = 'HRoiScbVTmFzKoQV/kqhRDn3ciiCkaq26YcIbG6ZNQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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