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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd3eb93b569d5709eaa2d26fcf828df53f06160e953cc44a0189d08708157a2c' 
  AND token = '/mtulH1t3o+Po+Nnko7e1xRiR6tjSIO76i3uz44SJFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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