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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2f1114223639c2f24a06e8960a28ce9173a938f08791dd42bf99e2db9194e1d' 
  AND token = 'IQ2HJDAN1I5fvOXIgcLUrsqIDEDGoCxFQMjutv+Ei+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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