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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3bff26b32ded45b984fe5ed205f85086b1a610a6ebdbaad98a6caa92ae56a93' 
  AND token = '8YbinjnOXWxvSIhkRc8bl6CC4yTk63+Cn3jlbBp47Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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