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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6404f849badec9f0eb727ceed60b8f55d1b5e502f14661be4e6c44dbc4ca2dde' 
  AND token = 'rDWOWx58QPBttqMPFCaZE0XNrT8XI5Dp20Sk7pLtlqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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