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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fbeee704d7514cb36d4ff5ecdaf9dfcb3888689b63079070243a4c12fee2309' 
  AND token = 'koGQ718rrlrAnu7+pUAladnyhFIC8fLwPgKnAimfhB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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