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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb8a729affcc73338e3f832622751f2b0a8385c9d9279d68f17f238de5b2fcc5' 
  AND token = 'FohgGzM5+xrNxh32hJREdGbl4m61+DrdFiTzfeiQr7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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