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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b871148b808df8ce60605b5f8eeb6e8121088bb6d655e7929b3b95b915e53fa7' 
  AND token = 'b7i2p5Jp6aIfr5BeHUvRlRqyCH291Ug3LIYem6I9qrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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