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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3329cd657f315aacc1c87ff3a3c4b896f294520c2d3cf34f3e1e9a62aa20832' 
  AND token = 'Q/aN46ZAB8CqMXQBh6jAOlgANrbTX+PkAySx5O0256A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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