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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6984a877c648802a6e9ba6f03bc3f0ae1b3f0ae60b3a46553ec74c6e54ace4fc' 
  AND token = '2UDkAgbqxsc+sP/MWVV6BHaHsgsqswMv1MU/UsP48OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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