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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67daf3a6490322bd831948b14f7af613e871c8e821e17eec02baca9fc1669260' 
  AND token = 'eV0LxpCDGOG854e+KnwB597nYLRXGMsdZKNT8pbBv1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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