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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fc1047329513d214b25d3e8be2c6a7f6377d58b1f14e81a345b0397066b75a2' 
  AND token = 'LabVQ0iymac2PDRJr8YUukDnT5AGwpFwCeFWkMm34s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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