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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92f43d3dbcb981409e7d24f30e4be49e1e41edfab61bbe43009c4180b1892934' 
  AND token = '3D7TpJLkkNLGRUHOOm4HvZdKlhh0OzHszbnMLHtqqHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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