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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f31253c9063113fa4b6acfe89f09a64ee6fbbef65cf5066584cb36a063bb41d' 
  AND token = '95mwIz/VEHEM+23AzO+vxifBZ8a9ece7tRQLCq8bnH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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