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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fef455bf74a90b2b5763671a0419ebd316e86b01e6adf809c30151a9461988b5' 
  AND token = '1aM7AWv/6LCgXwahXm+5L+PEVmVz9b81iC133Kaf0PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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